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Common Stock - Narrative (Details) - $ / shares | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 31, 2018
Class of Stock [Line Items] |  |  |  |
Common stock authorized (in shares) | 19,333,333 | 100,000,000 | 19,333,333 | 100,000,000
Common stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001 | $ 0.0001 | $ 0.0001
Preferred stock authorized (in shares) |  | 5,000,000 |  | 5,000,000
Preferred stock, par value (in dollars per share) |  | $ 0.0001 |  | $ 0.0001
Preferred stock issued (in shares) |  | 0 |  |
Preferred stock outstanding (in shares) |  | 0 |  |
Common stock, dividends declared (in dollars per share) |  | $ 0 | $ 0 |
Series 1 Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock authorized (in shares) | 6,000,000 |  |  |
Series 2 Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Increase in common stock authorized (in shares) | 555,555 |  |  |
Common stock authorized (in shares) | 13,333,333 |  |  |

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